Epoxy resins should not be confused with Epoxy-Ester Paints. These normally come in two pack consisting of epoxy resin and a curing agent (generally an amine or a polyamide resin) which is mixed prior to application. They are expensive owing to removal of unwanted side products and also have a gloss finish. They may also have good flexibility and toughness. These paint have a good adhesion, apart from there excellent chemical resistance. Epoxy ResinsĬhemicals which may be produced from petroleum and natural gas are the source of epoxy resins. Vehicles of this type show extremely good resistance to severe weather conditions 1.
What is paint made of consist free#
Alkyd need not be made from oil, as an oil-fatty acid or an oil free acid may be used. The name alkyd arises from the ingredients alcohol and acids. These vehicles provide a further improvement in the drying time and film forming properties of drying oils. Some of these resins may react with drying oil to give a faster drying vehicle. The vehicle incorporates natural or artificial resins into drying oil. To accelerate the drying by the natural reaction with oxygen, driers are used. These consist mainly of vegetable drying oils such as Linseed oil and Tung oil. The Bitumen or pitch may also be blended by heat with other materials to form a vehicle. Simple solutions of bitumen or pitch are available in solvent naphtha or White spirit. The following are various types of paints used on ships, These are classified as per their binders / vehicle as explained earlier. After application the solvent evaporates.Dissolve the binder and reduce the viscosity of the paint to a level which is suitable for the various methods of application.The function of the solvent in paint is to: Solvents are used in paints principally to facilitate their application. Pigments can be divided into the following types: Pigments and extenders are used in the form of fine powders which are dispersed into the binders of various particle sizes. Drying of paint is by solvent evaporation and there is no chemical change. Simple solutions of various resins or polymers are dissolved in suitable solvent(s). Non-Convertible binders do not involve any chemical reaction, but loss of solvent by evaporation. Reaction with moisture in the atmosphere.Reaction with an added chemical curing agent.The film progressively becomes more chemically complex by: Solvent is lost from the film by evaporation and the film becomes dry to the touch. For Example: Epoxy Paints, Chlorinated Rubber Paints, Alkyd Paints etc.īinders are generally classified into two classesĬonvertible binders are associated with chemical reaction and work in two stages Paints are generally named after their Binder component. Binder can be of liquid type, solid type or solid type with curing agents. Bindersīinders determine the physical and chemical characteristics of the paint coating. Solvents in the paint help in the application of the paint. Binder (Sometime the binders are termed as vehicle, medium, resin, film former or polymer)īinder and the pigment in the paint form the dry paint film.Now, before we proceed to types of Paints, let us first understand the constituents of paint Constituents of paints Paints when applied on a structure create barrier between the structural surface and corrosion causing phenomenon. There are different types of paints available as per requirements and place of application on ship. Paints are the chief material used on board ships for corrosion prevention.
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